CDPH Lead Inspector/Assessor California State Practice Exam

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Prepare for the CDPH Lead Inspector/Assessor Exam in California. Study with multiple choice questions, including detailed hints and explanations to enhance your understanding. Get ready for your certification!

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What is the equivalent of 1 ppm in mg/kg?

0.1 mg/kg
1 mg/kg
10 mg/kg
100 mg/kg

The correct answer is: 1 mg/kg

To understand the relationship between parts per million (ppm) and milligrams per kilogram (mg/kg), it's essential to recognize what each unit measures. PPM is a way to express very low concentrations of substances, indicating how many parts of a substance are present per million parts of a total mixture. In the case of 1 ppm, it means that for every one million parts of a substance (like water or soil), there is one part of the target substance. When this is converted to a weight basis, particularly in the context of solutions or solids, 1 ppm is equivalent to 1 mg of the substance in 1 kg of the total mixture because 1 kg is equal to 1,000 grams, and there are 1,000,000 mg in 1 kg. Hence, 1 mg of a substance per kg of a mixture corresponds to a concentration of 1 ppm. Thus, when referring to the conversion, 1 ppm is directly equal to 1 mg/kg. This is why the right answer is 1 mg/kg.